Eating more fat is not the goal of ancestral eating, but it seems to go hand-in-hand with the ancestral diet if you cut out grains and legumes, which can make up about 50% of the "standard" diet. Let's say, in round numbers, you want to eat 2,000 kcal per day; that would be 1,000 kcal of carbs, or 250 g from carbs. In other words, you need to replace about 10 servings of bread and beans, which you are not eating, in order to get enough calories to be satisfied. You wouldn't want to make a straight protein substitution because you'd be eating way too much protein. Some people go straight for the bananas, as in 30 bananas per day, but that might seem a little quirky to most people. So yes, you do eat more fat.
I say: find your own balance, somewhere between the seal-eaters and the tuber-eaters. Once you have a good starting point, you can gradually move in one direction or another for the sake of experimentation or availability.
